Do-it-yourself air

When Beijing was hit with horrific bad smog in early 2013, one group of friends saw past the fog to a bright spark of opportunity - creating and selling homemade air filter kits. Eric Jou has the story.

In early 2013, northern China was hit with a particularly bad spell of poor air quality. This period in Beijing became known around the world as the "airpocalypse", and the nation's capital was compared to the futuristic dystopia depicted in movies such as Blade Runner. However, for one team of young Americans and Chinese, the air crisis was the inspiration for a brilliant project.

Gus Tate, who has been in China since 2007, has spearheaded a project with his friends and partners to educate people who live in Beijing about the benefits of having an air filter in the home.